SpamAssassin

● Identity checked

Security · Vendor site 2026-10-04

Apache SpamAssassin is an open-source email spam filter that scores messages using heuristics, DNS blocklists, Bayesian analysis, and plug-in rules. Mail administrators integrate it with MTAs to classify and block unsolicited bulk email.

Updated 2026-10-04View sources

Official website

Category: Security
Free access: Apache SpamAssassin is an Apache Software Foundation open-source project available from project download pages.
API access: Not confirmed

Is SpamAssassin right for you?

A good fit for

Mail system administrators who need a mature, pluggable anti-spam engine for self-hosted email infrastructure.

Before you choose

The Apache project site distributes software and documentation but does not sell a hosted filtering SaaS with subscription pricing.

Enterprise open-source spam filter

Apache SpamAssassin provides a scoring framework and plug-ins mail admins use to filter spam on self-managed mail servers.

What it can do

Features & capabilities

Unknown is different from unavailable. Each fact carries its own evidence.

Capability	Value	Evidence	Checked
Spam filtering	Welcome page states Apache SpamAssassin classifies email and blocks spam using heuristic and statistical tests.	Facts sourced	2026-10-04
Recent release	News section announces Apache SpamAssassin 4.0.2 as a patch release with Unicode support improvements.	Facts sourced	2026-10-04
ASF project	Site notes SpamAssassin is a project of the Apache Software Foundation with wiki and mailing list resources.	Facts sourced	2026-10-04

Understand the total cost

SpamAssassin pricing & plans

Free

Apache SpamAssassin is an Apache Software Foundation open-source project available from project download pages.

Access: Apache SpamAssassin is an Apache Software Foundation open-source project available from project download pages.

Explore pricing & history

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The practical questions

Frequently asked questions

What is SpamAssassin used for?

Does SpamAssassin have a free plan?

Apache SpamAssassin is an Apache Software Foundation open-source project available from project download pages.. This record lists ongoing free access; check the plan limits before starting.

How much does SpamAssassin cost?

No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.

Can I use SpamAssassin through an API?

Not confirmed. API access and subscription access may have different terms; consult the linked sources.

What should I check before choosing it?

The Apache project site distributes software and documentation but does not sell a hosted filtering SaaS with subscription pricing.

Price history

No retained pricing changes yet. A current price alone does not establish a historical trend.

How this profile is supported

Identity and profile

Reviewed vendor source

Read original source ↗

2026-10-04

Facts apply to the named version and check date. Send a sourced correction if something changed.